I've had an experience with Tamiflu I wanted to share. A few months ago my then six-month-old choc lab pup Macadamia came down with parvo. By the time I got her to the vet, she was dehydrated to the point where she was unable to keep water down and completely lethargic. She was set up with intensive care - IV fluids, etc. and ended up staying for five days. However, her littermate brother was showing no signs of coming down with it at the time I brought Macadamia in: the vet sent us home with Tamiflu for him, and he never contracted the virus to the point where he was even noticeably affected by it. That was the firt time I'd heard of Tamiflu, and I was very interested to come across mention of it here.
Being a breeder for over 50 yrs, ya'll sure got it easy. Back when, before the shots, we fought parvo, didn't even have a name for it then, with rice water, asprin, and anything we could get into them. Vet medicine has come a long, long way
There is stuff now, used with Tamiflu, they barely need to get sick. Though some in the litter may get worse than others, due to individual immune systems.
Of course the hydration under the skin is necessary. I like to use pepto-bismo for the tummy, though there is a 'stronger' orange colored prescription anti-nausea the vet can prescribe. Anti-biotic either injected (if they can't hold anything down) or oral are necessary. And then to start growing the intestinal 'follicles' back, there is yogurt, danactive, and Forti flora.
Dyne is a high fat liquid product that you can purchase by the gallon and is also recommended for recovering Parvo pups.
If it ever does become an issue in your home or kennel NEOPAR is also a 'must'. It is an extremely high titer vaccine that is safe to give to puppies as young as 3-4 weeks. --yes, it's not ideal, but it is better than a puppy dead at 5 weeks because you wanted to wait until 8 weeks for the first shots.
I was horrified when my first puppy was diagnosed with it, shocked and in disbelief. I thought all was lost, but really when you know how to treat it, and know what to look for to catch it early, it's not 'that bad'.
Boxers are like cookies you can't have just one :)